#include <napi/native_api.h>
#include <string>
#include <cctype>

static napi_value Add(napi_env env, napi_callback_info info)
{
    size_t argc = 2;
    napi_value args[2] = {nullptr};

    napi_get_cb_info(env, info, &argc, args , nullptr, nullptr);

    napi_valuetype valuetype0;
    napi_typeof(env, args[0], &valuetype0);

    napi_valuetype valuetype1;
    napi_typeof(env, args[1], &valuetype1);

    double value0;
    napi_get_value_double(env, args[0], &value0);

    double value1;
    napi_get_value_double(env, args[1], &value1);

    napi_value sum;
    napi_create_double(env, value0 + value1, &sum);

    return sum;
}

static napi_value ToUpperCase(napi_env env, napi_callback_info info)
{
    size_t argc = 1;
    napi_value args[1] = {nullptr};

    napi_get_cb_info(env, info, &argc, args, nullptr, nullptr);

    // 检查参数类型是否为字符串
    napi_valuetype valuetype;
    napi_typeof(env, args[0], &valuetype);
    if (valuetype != napi_string) {
        napi_throw_type_error(env, nullptr, "String expected");
        napi_value result;
        napi_create_string_utf8(env, "", NAPI_AUTO_LENGTH, &result);
        return result;
    }

    // 获取字符串长度
    size_t str_length;
    napi_get_value_string_utf8(env, args[0], nullptr, 0, &str_length);

    // 分配内存并获取字符串内容
    char* buffer = new char[str_length + 1];
    size_t copied_length;
    napi_get_value_string_utf8(env, args[0], buffer, str_length + 1, &copied_length);
    buffer[str_length] = '\0';

    // 将字符串转换为大写
    std::string input_str(buffer);
    std::string result_str = input_str;
    for (size_t i = 0; i < result_str.length(); i++) {
        if (std::islower(result_str[i])) {
            result_str[i] = std::toupper(result_str[i]);
        }
    }
    delete[] buffer;

    // 创建返回值
    napi_value result;
    napi_create_string_utf8(env, result_str.c_str(), NAPI_AUTO_LENGTH, &result);

    return result;
}

EXTERN_C_START
static napi_value Init(napi_env env, napi_value exports)
{
    napi_property_descriptor desc[] = {
        { "add", nullptr, Add, nullptr, nullptr, nullptr, napi_default, nullptr },
        { "toUpperCase", nullptr, ToUpperCase, nullptr, nullptr, nullptr, napi_default, nullptr }
    };
    napi_define_properties(env, exports, sizeof(desc) / sizeof(desc[0]), desc);
    return exports;
}
EXTERN_C_END

static napi_module demoModule = {
    .nm_version = 1,
    .nm_flags = 0,
    .nm_filename = nullptr,
    .nm_register_func = Init,
    .nm_modname = "str_cap",
    .nm_priv = ((void*)0),
    .reserved = { 0 },
};

extern "C" __attribute__((constructor)) void RegisterStr_capModule(void)
{
    napi_module_register(&demoModule);
}
